[talk-au] Routing problem near Albany, WA

[Josh Marshall]

Hi Ian,

You can copy+paste the URL when you’re looking at the section in question
on openstreetmap.org.

https://www.openstreetmap.org/search?query=menang%20drive#map=18/-34.96511/117.82114&layers=D

I’ve turned the data layer on so you can just click on the nodes and ways
to see their details, and then you can copy that URL to reference it:

https://www.openstreetmap.org/way/853070680

So on to the question, I suspect it’s a router issue, but quite possibly
something to do with Menang Drive having tagging with bicycle=yes
cycleway:left=yes etc, but the Albany Highway ways not having anything of
the sort, not even lane quantity.

Probably not relevant, but that greater intersection looks like it’s been
mapped with a variety of aerial sources but without imagery offsets being
taken into account. The Maxar layer looks like the most recent, and once I
aligned that best I could (5.24, -9.89), there are still a number of roads
that are well off the imagery.

And the little bike diversions for merging across aren’t mapped… but good
riddance, they’re definitely designed by someone who thinks that it’s fine
for cyclists on major highways who could be doing 35 km/h to slam on the
brakes to take a 90º  turn to cross a lane… ugh.

On 7 Jun 2023, at 12:00 pm, Ian Steer <iansteer at iinet.net.au> wrote:

My Garmin GPSMAP 66i gives misleading routing instructions at a new
intersection on Albany Highway near Albany when using OSM data.  I have
looked at the OSM data through JOSM and it all looks good.  I wondered if
anyone else can see what might be causing the strange routing instructions.

The explanation really needs pictures, so I’ve put them in Dropbox:

Screenshot 1 shows the first OSM way of the section in question
(highlighted in red) plus some annotations about the points where the GPS
has instructions for the two misleading manoeuvres:
https://www.dropbox.com/s/mk7pmpucvp9y5q6/screenshot%201.jpg?dl=0

Screenshot 2 just shows the other OSM way that covers the section in
question:
https://www.dropbox.com/s/wpfaip74htzbnyw/screenshot%202.JPG?dl=0

Screenshot 3 shows the routing instructions on the GPS:
https://www.dropbox.com/s/4hy8r91c5syvq4d/screenshot%203.JPG?dl=0

I don’t know how to give OSM way references, but the intersection is at
S34.9647 and E117.8205 (Menang Drive and Albany Highway)

Has anyone got any clues why the GPS would be doing what it is doing ?

Thanks

Ian
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